(x-y)(x-2y)-(3x-2y)(x-3y)答案应为-2x-x*x-3x,
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(x-y)(x-2y)-(3x-2y)(x-3y)答案应为-2x-x*x-3x,
(x-y)(x-2y)-(3x-2y)(x-3y)
答案应为-2x-x*x-3x,
(x-y)(x-2y)-(3x-2y)(x-3y)答案应为-2x-x*x-3x,
原式=x²-2xy-xy+2y²-(3x²-9xy-2xy+6y²)
=x²-3xy+2y²-(3x²-11xy+6y²)
=x²-3xy+2y²-3x²+11xy-6y²
=-2x²+8xy-4y²
原式=x*x-2xy-xy+2y*y-3x*x+9xy+2xy-6y*y
=-2x*x+8xy-4y*y
答案错了吧。。。。。。。
告诉你,答案是错的
-2x-x*x-3x(答案不可能连同类项都不合并吧??)你仔细看看
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